<template>
  <div id="tags-view-container" class="tags-view-container">
    <!-- 路由标签显示区域（滚动）组件 -->
    <scroll-pane ref="scrollPane" class="tags-view-wrapper" @scroll="handleScroll">
      <router-link v-for="tag in visitedViews" ref="tag" :key="tag.path" :class="isActive(tag) ? 'active' : ''"
        :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }" tag="span" class="tags-view-item"
        :style="activeStyle(tag)" @click.middle.native="!isAffix(tag) ? closeSelectedTag(tag) : ''"
        @contextmenu.prevent.native="openMenu(tag, $event)">
        {{ tag.title }}
        <!-- 这个地方一定要click加个stop阻止，不然会因为事件冒泡一直触发父元素的点击事件，无法跳转另一个路由 -->
        <span v-if="!isAffix(tag)" class="ui-icon-close" @click.prevent.stop="closeSelectedTag(tag)" />
      </router-link>
    </scroll-pane>
    <ul v-show="visible" :style="{ left: left + 'px', top: top + 'px' }" class="contextmenu">
      <!-- <li @click="refreshSelectedTag(selectedTag)"><i class="el-icon-refresh-right"></i> 刷新页面</li> -->
      <li v-if="!isAffix(selectedTag)" @click="closeSelectedTag(selectedTag)"><i class="el-icon-close"></i> 关闭当前</li>
      <li @click="closeOthersTags"><i class="el-icon-circle-close"></i> 关闭其他</li>
      <li v-if="!isFirstView()" @click="closeLeftTags"><i class="el-icon-back"></i> 关闭左侧</li>
      <li v-if="!isLastView()" @click="closeRightTags"><i class="el-icon-right"></i> 关闭右侧</li>
      <li @click="closeAllTags(selectedTag)"><i class="el-icon-circle-close"></i> 全部关闭</li>
    </ul>
  </div>
</template>

<script>
import ScrollPane from './ScrollPane'
import util from "@/utils/index.js";
import { mapGetters } from 'vuex'
export default {
  components: { ScrollPane },
  data() {
    return {
      // 右键菜单隐藏对应布尔值
      visible: false,
      //右键菜单对应位置
      top: 0,
      left: '210',
      // 选择的标签
      selectedTag: {},
      // 固钉标签，不可删除
      affixTags: []
    }
  },
  // 计算属性
  computed: {
    ...mapGetters([
      'visitedViews'
    ]),
  },
  // 监听
  watch: {
    // 监听路由变化
    $route() {
      this.addTags()
      this.moveToCurrentTag()
    },
    //监听右键菜单的值是否为true，如果是就创建全局监听点击事件，触发closeMenu事件隐藏菜单，如果是false就删除监听
    visible(value) {
      if (value) {
        document.body.addEventListener('click', this.closeMenu)
      } else {
        document.body.removeEventListener('click', this.closeMenu)
      }
    }
  },
  // 页面渲染后初始化
  mounted() {
    this.initTags()
    this.addTags()
  },
  methods: {
    isActive(route) {
      return route.path === this.$route.path
    },
    activeStyle(tag) {
      if (!this.isActive(tag)) return {};
      return {
        "background-color": this.theme,
        "border-color": this.theme
      };
    },
    isAffix(tag) {
      return tag.meta && tag.meta.affix
    },
    isFirstView() {
      try {
        return this.selectedTag.fullPath === this.visitedViews[1].fullPath || this.selectedTag.fullPath === '/index'
      } catch (err) {
        return false
      }
    },
    isLastView() {
      try {
        return this.selectedTag.fullPath === this.visitedViews[this.visitedViews.length - 1].fullPath
      } catch (err) {
        return false
      }
    },
    initTags() {
      let defaultTags = [{
        fullPath: "/home", hash: "", meta: { title: "首页" }, title: "首页", name: "home", path: "/home", title: "首页",
      }]
      let affixTags = JSON.parse(sessionStorage.getItem('visitedViews')) || defaultTags
      for (const tag of affixTags) {
        // 必须包含name
        if (tag.name) {
          this.$store.dispatch('vxadmin/tagsView/addVisitedView', tag)
        }
      }
    },
    /* 添加页签 */
    addTags() {
      const { name } = this.$route
      // 由于路由被JSON转化的对象里的子项存在循环引用 深拷贝路由存入store
      let newRoute = Object.assign({}, this.$route)
      delete newRoute.matched
      if (name) {
        this.$store.dispatch('vxadmin/tagsView/addView', util.replacerFunc(newRoute))
      }
      return false
    },
    /* 移动到当前页签 */
    moveToCurrentTag() {
      const tags = this.$refs.tag
      this.$nextTick(() => {
        for (const tag of tags) {
          if (tag.to.path === this.$route.path) {
            this.$refs.scrollPane.moveToTarget(tag)
            // 如果fullpath不一致 则更新VisitedView
            if (tag.to.fullPath !== this.$route.fullPath) {
              // 由于路由被JSON转化的对象里的子项存在循环引用 深拷贝路由存入store
              let newRoute = Object.assign({}, this.$route)
              delete newRoute.matched
              this.$store.dispatch('vxadmin/tagsView/updateVisitedView', util.replacerFunc(newRoute))
            }
            break
          }
        }
      })
    },
    //刷新 暂时无用
    // refreshSelectedTag(view) {
    //   this.$store.dispatch('vxadmin/tagsView/delCachedView', util.replacerFunc(view)).then(() => {
    //     const { fullPath } = view
    //     this.$nextTick(() => {
    //       this.$router.replace({
    //         path: fullPath
    //       })
    //     })
    //   })
    // },
    closeSelectedTag(view) {
      this.$store.dispatch('vxadmin/tagsView/delView', util.replacerFunc(view)).then(({ visitedViews }) => {
        if (this.isActive(view)) {
          this.toLastView(visitedViews, view)
        }
      })
    },
    closeRightTags() {
      this.$store.dispatch('vxadmin/tagsView/delRightTags', this.selectedTag).then(visitedViews => {
        if (!visitedViews.find(i => i.fullPath === this.$route.fullPath)) {
          this.toLastView(visitedViews)
        }
      })
    },
    closeLeftTags() {
      this.$store.dispatch('vxadmin/tagsView/delLeftTags', this.selectedTag).then(visitedViews => {
        if (!visitedViews.find(i => i.fullPath === this.$route.fullPath)) {
          this.toLastView(visitedViews)
        }
      })
    },
    closeOthersTags() {
      this.$router.push(this.selectedTag)
      this.$store.dispatch('vxadmin/tagsView/delOthersViews', this.selectedTag).then(() => {
        this.moveToCurrentTag()
      })
    },
    closeAllTags(view) {
      this.$store.dispatch('vxadmin/tagsView/delAllViews').then(({ visitedViews }) => {
        if (this.affixTags.some(tag => tag.path === this.$route.path)) {
          return
        }
        this.toLastView(visitedViews, view)
      })
    },
    toLastView(visitedViews, view) {
      const latestView = visitedViews.slice(-1)[0]
      if (latestView) {
        this.$router.push(latestView.fullPath)
      } else {
        //如果没有标签视图，则重定向到主页，
        this.$router.replace({ path: '/home' })
      }
    },
    //计算右键弹出位置
    openMenu(tag, e) {
      const menuMinWidth = 210
      const offsetLeft = this.$el.getBoundingClientRect().left
      const offsetWidth = this.$el.offsetWidth
      const maxLeft = offsetWidth - menuMinWidth
      const left = e.clientX
      this.left = left
      this.top = e.clientY
      this.visible = true
      this.selectedTag = tag
    },
    closeMenu() {
      this.visible = false
    },
    handleScroll() {
      this.closeMenu()
    }
  }
}
</script>

<style lang="scss" scoped>
.tags-view-container {
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #d8dce5;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);

  .tags-view-wrapper {
    .tags-view-item {
      display: inline-block;
      position: relative;
      cursor: pointer;
      height: 34px;
      line-height: 34px;
      color: #495060;
      background: #fff;
      padding: 0 10px;
      font-size: 12px;
      margin-left: 5px;

      &:first-of-type {
        margin-left: 15px;
      }

      &:last-of-type {
        margin-right: 15px;
      }

      &.active {
        background: #F2F4FA;
        color: #6178FF;
      }
    }
  }

  .contextmenu {
    margin: 0;
    background: #fff;
    z-index: 3000;
    position: absolute;
    list-style-type: none;
    padding: 5px 0;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 400;
    color: #333;
    box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);

    li {
      margin: 0;
      padding: 7px 16px;
      cursor: pointer;

      &:hover {
        background: #eee;
      }
    }
  }
}
</style>


